All of the above, IMHO, are perfectly and absolutely sensible answers...that said, I think the best way to neutralize any "bubbling-possibly-into-violence" interpersonal conflict, regardless of the stuff the aggressor may or may not know, is to assume either what Tony Blauer would call a "submissive strategy" (ie. assume a "non-violent" posture--let's say a somewhat bladed stance, knees bent, hands up, relaxed, and held in front of you with elbows bent, in a calming "I-don't-want-any-trouble-mister" manner, and sincerely attempt to verbally DE-ESCALATE the situation so that both of you don't have to do any kinda violence, while staying aware of any possible false moves on the bad guy's part...failing that, capitalise upon his belligerent false sense of security--which you will have established through the use of choice speech and nonthreatening/telegraphic posture, and hit him first, hard, rapidly, and to the vitals (like the eyes, ears/temples, throat/sides and back of neck, solar plexus, groin/bladder, knees, shins, top of foot) repeatedly until he's broken and down--"Science of the Sucker Punch"--then run like hell, or call the cops, etc.--whatever is appropriate at the time) or, if it is REALLY a potential horror-show situation about to explode, then you will have to deploy a concealed weapon (use same submissive/sucker-punch stategy above, practice covert/quick draws). Hopefully, you won't have to end the guy. Know how to do so, just in case. Also be aware of less lethal targets. Use those, if you can. Lotsa info on that here on Bladeforums. Explore and see.
Guns and knives (and impact weapons, like Asp batons, to a lesser degree) are terrifying street-equalizers, I don't care what style your attacker does. And they are all over the place. If you do FMAs already, ya know what I mean.
These things, which will work in every situation, regardless of whether the bad guy is a good kicker, trapper, puncher or grappler, may seem totally dirty and uncool, but that's what real violence is like--no styles, no systems, just rapidfire stinking cruelty that you wanna survive and go home from and try to heal your spirit in the aftermath.
You use deception, stealth, and ruthlessness--strategy and tactic--to GET to be able to go back home.
And this is why these days, I prefer to stay home and read and write poetry and short stories and surf the Net and listen to blues and soul music and daydream and hang out with gorgeous, artsy chicks than think about fights (that is, when I'm not researching and training in Kali and CQC! LOL).
Incidentally, if your environmental awareness and sensitivity to violent intent is up and running like it should be, you probably won't have to deal with stuff like kung-fu dueling, among other things...unless you choose to, in which case ya might deal with somebody using the above methods on you...yeeesh, do yourself a favor, don't let that happen.
Just my humble, if crankily and totally sleep-deprived insomniac opinion...
bayani